On Fri, Apr 03, 2020 at 07:37:10PM +0300, Georgios wrote: > > Hi. > Im trying to set intel_iommu=on on kernel parameters at grub but for > some reason it doesnt work. > > I edit /etc/default/grub file and i add the parameter. > > then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then i > reboot. > > when i run virt-host-validate i get > > QEMU: Checking if IOMMU is enabled by kernel: WARN (IOMMU appears to be > disabled in kernel. Add intel_iommu=on to kernel cmdline arguments) > > when i edit the grub menu durring boot and i put intel_iommu=on and the > i run again virt-host-validate i get > > QEMU: Checking if IOMMU is enabled by kernel: PASS > > > any ideas? This is a libvirtd KVM machine? Are you sure you're using UEFI? -- Jonathan Billings <billings at negate.org>